Boiler.



1" B. PLUM BOILER.

APPLICATION FILED JULY19, I915.-

Patented Feb. 15, 1916.

2 SHEETS-SHEEI I.

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THE COLUMBIA PMxflQGRAPH c0.. WASHINGTON, D. c.

J. B. PLUM,

BOILER. APPLICATION FILED IULY M21915.

1,172,043. Patented Feb. 15,1916.

2 SHEETS-SHEET 2- l\|l|l\|\lllllil 1 M JZ v 1 To all whom it may] concern:

* plura srn 'rns Enron.

IJoHiv B. PLUM;"or-'nonrrr vannvm, WASHINGTON.

B'OILEB;

operationwthan those heretofore employed.

a To this end, I provide a boiler equipped with a bottom having inclined surfaces, by

means of which the heating area is increased and-the circulation of the water improved. I also provide a boiler with smoke fineslocated adjacent the bottomand shaped to conform therewith. Q a Ixnorder that the inventionmay be readily understood, reference is had to the accompanying drawings, forming apart of this specification, and-in which," Figurel is a longitudinal sectionthrough thegboiler' or cooker-constructed in accordance withamy invention; Fig. 2 is a cross section thereof; Fig. 3 is a sectional elevation taken-substantially on the line. 3-3 of Fig. 1, looking in the direction of the arrow; Fig; e is a-ocro'ss; sectional view similar to Fig. 2, showinga slightly modifiedyform' of*cooker;;an'd,-" Fig. 5 is a similar view showing a still further modified construction. 7. 3

Referring to the drawings in detail, my improved cooker comprises a furnace having the side walls 1 supporting. suitable grate bars 2, and terminating at its upper edge in a head or flange 3. The firebox of the furnace has a rear wall 4, from which extends a horizontal fine 5 This flueis provided with end and top walls 6 and 7 respectively, forming a conduit for conveying the products of combustion'into the kettle flues hereinafter described. The rear end of the-furnace is preferably supported by means of a suitable leg or prop 8. Seated in the open top of the furnace is a kettle 9, having a top 10 which fits substantially steam-tight and is provided with a steamescape pipe 11. The bottom of this kettle is of peculiar and novel construction. Along each side is provided a comparatively thin Specification oflz etters Patent; Patented culation of thewater.

1915 seaa 'maoym.

' pocket ori trough From the inner edge of eachpocketextends aninclined wall i i 13, inwardly and downwardly to a point on a level 'with'the bottom of the pockets 12. The lower edges ofthese inclined walls I join, a comparatively narrow horizontal bottom 14.;

In'the constructionshown in Figs. 1 and,

2,1 provide apair of smoke tubes which I are indicated at 15 and 16. Eachofthesev is formed. with an inclined outer wall eX-' tending adjacentand parallel with the cor- I responding wall 13 of the bottom of the kettle, and forming betweenitself and such wall a' comparatively thin sheet 17 of water. The bottoms of the fines 15 and 16 are parallelwith-the-bottom 14. of the kettle and spacedfltherefrom= a similar distance. ,7 The,

inner; sides of'theflues15 and 16 are vert ical and spacedfapart so as to form a vert1- cal column-or sheet of water 18.

It willbe notedthat the upper sides, such as 15?; ofthefiueslfii and 16 are fiat and lie in the same plane, and on these flat surfaces; rest the bottoms of the trays 1n which the fruit cans are placed. The water may 5 I extend only tothe level indicated at m and the trays may be of any suitableconstruction'. They'are'shown in dotted lines and in dicated by the referencecharacter.

When assembled, the kettle andfurnace are; sorelated that "the products of combus tion. flowing through the conduit defined by the walls 5, 6, and 7 ,7 are deliveredinto the rea r'i ends of the "fines .15 --and1-1-6,'-'and passing forwardly through such, fines, disa charge intoasniolre stack'19i. lt will thus be seen that the water in the pockets 12 and along the walls 13'and-14- is exposed to the direct heat of the fire, while the water between and above the lines 15 and 16. is strongly heated by the passage of the hot gases and products of combustion through such flues. p

The disposition of the inclined walls of the bottom and fines induces a violentcire such pockets. and steam bubblesare also formed along these walls. The-water also From the pockets12 the water rises along the inside walls of 3 v passes downwardly along the inclined walls 5 13 and upwardly through the space 18, and also upwardly along the lower inclined surwalls 13. V

In order-t0 drain the water from the kettle faces of the fines 15 and 16 opposite the 1 i when desired, arrange a drain pipe 20, extending across the bottom of vthe:kettle;

' and connected to. the three lowest points thereof as shown in Fig.2.: This drain pipe is preferably provided with a stop 0001121. 7 InFig; 4, I have showna kettlebonstructa ed :with but .a: single-smoke flue 22. This has a flat top wall 22* on which the trays rest, and inclined sidewalls-similar to those :shown in Fig 2. 7 The circulation is gen- "'e'rallysimilar,although probably not so eiiicient as in, the form shownin Fig-'2.

Nhil'e in the construction sofar described,

I have shown" a kettle'havingj bottom plates- ,and flue walls disposed in 'angularrelation.

to each other, I -have-illustrated in Fig; 5 a

I kettle in which curved bottom plates .and

- flue sheets are employed. The same water pockets @12 along the sides are, preserved, and two lines 28' and 24 are illustrated These flues have semi-circular bottoms and. fiat tops 23 upon which the trays rest; The sideredges are preferably beveled offlas indicated at 2%; Thebottom of the-kettle is formed of two semi-cylindrical portions, conforming" inshape' with theibottoms of the fines 23*and '24, and spaced therefrom to thence outwardly: and

form curved water sheets 25.- These unite at the center as shown at 26. It will be observed that in this construction=also the water spaces areinclined so that circulation of watertakes place up and down the side wallsthereofl the tendency being for: the Water to rise upwardly atf26 and flow downwardly @into the pockets -12.

, From theabove, it willbe: seen that in, all three forms of kettle,-I have provided inclined walls and fines which afford :in-: creased'iheating surfaceand which produce an efficient circulation, and itis thought that "the many advantages of the invention will be readily understood without further" discussion. I

In some cases, especially in the small Copies of this patent niayibe obtained for iunitsgitg may 'be "desirableito omitfthe re-f turn fines, and use'my-improved boiler in],

connection with any ordinary stove or fur n'ace. In such -case,= however l retain. 3 the; irregular bottom withthe inclined surfaces 7 and reentrant angles and secure theresulting 7 advantages of better circulation and inks;v

creased heatingsurfacel WVhat I cla1m-1s2= 1. A boiler having a continuous bottom; depressed; at its icenterg-"and sloping fup -z wardly at each side, and a smoke ,fluiehav 'ing [continuous side a and ibottom walls conp forming with the shape tsaid, ,bottommnd spaced therefrom to providea relatively thin upwardly rand: outwardly": inclinedisheet'iofi water of uniform thickness.

2. a boilerhavlngra pocket extending along each" outside wall; theybottom' of 7: said "I boiler havingfa portion intermediate asald' pockets of substantiallyjthesame level as the lowest points of said "pockets, and other.

portions sloping iipwardlyirom said lower-Q most portion, to Y the: highest point 10f isaid pockets, and a vflue'ain said boiler Ihavingg, walls conformingwithfandi spaced from bottom. 7

3. A boiler havingia'smoke: flue extending} therethrough; said; .fiue having a flat :1 top; widerthan the bottoman'd adapted toi-sup;-

portican holding trays," and inclined sides so disposed as to causewater to circulate upwardly therealong, when the flue" is: heated? p j 4. A boiler having, :anextended ibo'ttom.

signature. 1

WashingtomD. C.

fivecent's each, byeddressing the Commissioner of mum's, (v w i I 

